What does Sangu Dao mean in Feng Shui? There are three land masters in a village.

This is the practice of confusing Feng Shui with customs.

In principle, there should be only one earth temple in a village or several villages. (Otherwise, which earth temple should a person report to when he dies? Several earth gods will have to fight). Moreover, in Feng Shui, the Earth Temple belongs to Yin, which is not good for Feng Shui. The Yang house (or even the Yin house) should be far away from the Earth Temple.

For reference.